Thisapplicationnoteexplainsthedesignoftranspon-
dercoils.AnExcelspreadsheetisusedtoautomatethe
updateofvalues,dependingonthespecifiedparame-
ters.Thespreadsheetfilenameistranspnd.xls.Azip
filecontainingthisspreadsheetandacopyofthisappli-
cationnotecanbedownloadedfromMicrochip’sweb
siteatwww.microchip.com.
Thebasicapproachistochoosethetranspondercoil
externaldimensions,sincevolumewillusuallybethe
primaryconstraintforacoilasitwillneedtofitintoa
keyfob,creditcardorothersmallvolume.Secondly,
propertiesofthecore,coilwindingsaswellasthe
equivalentloadplacedacrossthecoilareentered.This
fixestheInitialCoilSpecification.
Oncetheinitialcoilisbuilt,measurementsaremadeon
thiscoiltodeterminethecoilqualityfactor.Thesemea-
surementsareusedtocalculatetheOptimumCoil
Specificationforasecondcoil.AN650DesigningaTransponderCoilfortheHCS410Authors:MikeSonnabend,JanvanNiekerkSPREADSHEETFEATURESMicrochipTechnologyInc.Thespreadsheetissplitintothreeworksheets.Thefirstworksheetconcernstheinitialcoilspecification.TheOVERVIEWinputstothisworksheetarethe:coilexternaldimensionsThisapplicationnoteexplainsthedesignoftranspon-dercoils.AnExcelspreadsheetisusedtoautomatethecoreeffectiverelative
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